3 files changed, 19 insertions, 42 deletions

diff --git a/src/compiler/nir/nir.c b/src/compiler/nir/nir.c
index 0d8a554bd20..a6240c11f2d 100644
--- a/src/compiler/nir/nir.c
+++ b/src/compiler/nir/nir.c
@@ -1854,34 +1854,32 @@ nir_system_value_from_intrinsic(nir_intrinsic_op intrin)
    }
 }
 
-uint64_t
-nir_get_dual_slot_attributes(nir_shader *shader)
+/* OpenGL utility method that remaps the location attributes if they are
+ * doubles. Not needed for vulkan due the differences on the input location
+ * count for doubles on vulkan vs OpenGL
+ *
+ * The bitfield returned in dual_slot is one bit for each double input slot in
+ * the original OpenGL single-slot input numbering.  The mapping from old
+ * locations to new locations is as follows:
+ *
+ *    new_loc = loc + _mesa_bitcount(dual_slot & BITFIELD64_MASK(loc))
+ */
+void
+nir_remap_dual_slot_attributes(nir_shader *shader, uint64_t *dual_slot)
 {
    assert(shader->info.stage == MESA_SHADER_VERTEX);
 
-   uint64_t dual_slot = 0;
+   *dual_slot = 0;
    nir_foreach_variable(var, &shader->inputs) {
       if (glsl_type_is_dual_slot(glsl_without_array(var->type))) {
          unsigned slots = glsl_count_attribute_slots(var->type, true);
-         dual_slot |= BITFIELD64_MASK(slots) << var->data.location;
+         *dual_slot |= BITFIELD64_MASK(slots) << var->data.location;
       }
    }
 
-   return dual_slot;
-}
-
-/* OpenGL utility method that remaps the location attributes if they are
- * doubles. Not needed for vulkan due the differences on the input location
- * count for doubles on vulkan vs OpenGL
- */
-void
-nir_remap_dual_slot_attributes(nir_shader *shader, uint64_t dual_slot)
-{
-   assert(shader->info.stage == MESA_SHADER_VERTEX);
-
    nir_foreach_variable(var, &shader->inputs) {
       var->data.location +=
-         _mesa_bitcount_64(dual_slot & BITFIELD64_MASK(var->data.location));
+         _mesa_bitcount_64(*dual_slot & BITFIELD64_MASK(var->data.location));
    }
 }
 
diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index b9393702097..bf4bd916d27 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -2119,12 +2119,6 @@ typedef struct nir_shader_compiler_options {
     */
    bool use_interpolated_input_intrinsics;
 
-   /**
-    * Do vertex shader double inputs use two locations? The Vulkan spec
-    * requires two locations to be used, OpenGL allows a single location.
-    */
-   bool vs_inputs_dual_locations;
-
    unsigned max_unroll_iterations;
 } nir_shader_compiler_options;
 
@@ -3039,9 +3033,8 @@ bool nir_opt_conditional_discard(nir_shader *shader);
 
 void nir_sweep(nir_shader *shader);
 
-uint64_t nir_get_dual_slot_attributes(nir_shader *shader);
 void nir_remap_dual_slot_attributes(nir_shader *shader,
-                                    uint64_t dual_slot);
+                                    uint64_t *dual_slot_inputs);
 uint64_t nir_get_single_slot_attribs_mask(uint64_t attribs, uint64_t dual_slot);
 
 nir_intrinsic_op nir_intrinsic_from_system_value(gl_system_value val);
diff --git a/src/compiler/nir/nir_gather_info.c b/src/compiler/nir/nir_gather_info.c
index de18c9bd78e..30f0bc721d4 100644
--- a/src/compiler/nir/nir_gather_info.c
+++ b/src/compiler/nir/nir_gather_info.c
@@ -88,21 +88,15 @@ static void
 mark_whole_variable(nir_shader *shader, nir_variable *var, bool is_output_read)
 {
    const struct glsl_type *type = var->type;
-   bool is_vertex_input = false;
 
    if (nir_is_per_vertex_io(var, shader->info.stage)) {
       assert(glsl_type_is_array(type));
       type = glsl_get_array_element(type);
    }
 
-   if (!shader->options->vs_inputs_dual_locations &&
-       shader->info.stage == MESA_SHADER_VERTEX &&
-       var->data.mode == nir_var_shader_in)
-      is_vertex_input = true;
-
    const unsigned slots =
       var->data.compact ? DIV_ROUND_UP(glsl_get_length(type), 4)
-                        : glsl_count_attribute_slots(type, is_vertex_input);
+                        : glsl_count_attribute_slots(type, false);
 
    set_io_mask(shader, var, 0, slots, is_output_read);
 }
@@ -165,13 +159,7 @@ try_mask_partial_io(nir_shader *shader, nir_variable *var,
       return false;
    }
 
-   bool is_vertex_input = false;
-   if (!shader->options->vs_inputs_dual_locations &&
-       shader->info.stage == MESA_SHADER_VERTEX &&
-       var->data.mode == nir_var_shader_in)
-      is_vertex_input = true;
-
-   unsigned offset = get_io_offset(deref, is_vertex_input);
+   unsigned offset = get_io_offset(deref, false);
    if (offset == -1)
       return false;
 
@@ -187,10 +175,8 @@ try_mask_partial_io(nir_shader *shader, nir_variable *var,
    }
 
    /* double element width for double types that takes two slots */
-   if (!is_vertex_input &&
-       glsl_type_is_dual_slot(glsl_without_array(type))) {
+   if (glsl_type_is_dual_slot(glsl_without_array(type)))
       elem_width *= 2;
-   }
 
    if (offset >= num_elems * elem_width * mat_cols) {
       /* Constant index outside the bounds of the matrix/array.  This could